Stop mechanism for sound-reproducing apparatus



T. J. MURPHY. STOP MECHANISM FOR SOUND REPRODUCING APPARATUS.

' APPLICATION FILED SEW-17,1917. 1,359,728.

- Patented Nov. 23, 1920.

2 SHEETS-SHEET .l.

INVENTORQ v A TTORNEYS.

WITNESS? T. J. MURPHY. STOP MECHANISM FOR SOUND REPRODUCING APPARATUS.

APPLICATION FILED S EPT. 17, 19W

Patented Nov. 23, 1920. v

TOR lain/g I N VEN ATTORNEYS.

s to provide a switch for governing the cir lTE s'r'rss 'PATEFNToer-ice.

THOMAS J. MURPHY, or-noonnsrnn, NEW ORK, ASSIIGNOR or-oN-E-HALr Toenner.

. V DUFFY, or noonnsrrnn, NEW YORK. n g

s'ror MECHANISM e01. sounnnnrnonuomeArrAn rus;

To all whom it may concern:

Be it known that LTHOMAS J. 'M RPI-IY,

of Rochester, in the county of Monroe and State of New York, haveinvented certain new and useful Improvements in Stop Mechanism forSound-Reproducing Apparatus; and I do hereby declare the following to bea full, clear, and'exact description of the same,reterence being had tothe accompanying drawings, orming part of this specification,'-and tothe reference Characters marked thereon' V i e r The purpose of myinvention istoafiord improvements in electrically driven soundreproducing machines whereby tosimplity the control of the machine andmake it easier for the operator to properly position the needle and tonearm so as to obtain accurate functioning with a record. In a morespecific aspect, the objectoif the improvement is i cuitot themotor-that drives the machine,

sov

having the switch under automatic regulation to open the motor circuitat any predetermined point tone arm across the record. Aiurther purposeof the invention isto provide a lamp in thecircuit which is located soas to illurninate the. record and facilitate positioning the tone arm.and govern the by the same 'switch' whichcontrols the motor circuit, in

a manner that makes it possibleto' furnish current to the lampindependently of the motor and while the latter is out pf operation. Anadditional object is to provide "an improved style of mounting for themotor and tor the governor which controls the speediof the turntable. Tothese and other ends the invention ,consists in certain nn- .provementsand: as .will be hereinafter more 'fully described, being pointed outin' the combinations of parts, all

features v the endof the specification. .In the drawings: 1

"Figure 1 is'a' planviewshowingthe application or the invention toaflatfrecord type of sound reproducing machine; 5

the novel .Fig. 2 is a bottom plan view of-theimotori board; p r a Fig.3 is a side elevation showing the switch and cooperating parts; insection; I,

Fig.4 is a plan view'of the switch in the position" which assumes withthe motor running;

Fig, 5 is a specification of L'etteris Patent.

' the turn during the travel of the flllp i eme es stationary abutment9, through which passes 1 f a ro'dw9 pivotally connected -ihy a yoke @9motor frame. Expanjrod,-on oppositesides of p mentioned-one actuatlngthewmo'tor. frameito- Fward-the driven member',-wh1le ,thelatterdiagrammatic view showing the governor arrangement of circuits andwith the switch in the same position'as n'Flg. 4-;

the centrifugal governor mounting. i

. a t No 23 1920 Application filed September 17,1917. Serial N011,91,735. Y

Fig. 6 is a similar diagrammatic view -of i Similar reference charactersthroughout the several views-indicate the sameparts.

' @The structure c'omprisesja swinging tone arm 1 which carries a soundbox-:2, amt-351s tablejupon "which the recordA 'ris arrangedfl'The turntable is driven a triction pulley 5 arranged upon the armature shaft'o'f a motor 6 which is electrically driven. Th n-motor 6 i ivotallydisposed between arms .7, as shown in Fig. 2,-wher'e' 7? :designatesi'eltbushings supporting ithe' pins carried by'the motortrame.'The't'elt bushings 7 restagainst shoulders 7on the arms. and are heldin placeby JheadsFY- ion the pins.

'3' are {fiber washerspositioned between-the heads 7 andthejfeltbushings.

Thereis sufficient clearance between the shoulders 7 and the pins Y7 toprevent the latter from ever contacting with the shoultiers, and thnsthe-rnotor rests entirely on the felt bushings, thereby preventing anyvibration orhu'm of the m'otor "it'rom' being-transmitted to or takenupfby the m'etal ori wooden parts which support it; The -pulley= 5iisheld iyieldi ngly' against-he turn t'able'iby adj-ust- To'-this end Iemploy a withthe end 10 of-the H I sion springsfi and 9 are locatedaround the abutment' 9,;the=fii st the tension exerted upon {the lhotorstrarn e.

Felt -ivashe-rs" 9 are positioned lupon the rod 9* against theabutmentfi, and-metal washers 9 are arrangedbetweeh theffelt wash ers-and fthemetal springs. iThecentrifugahgovernor is similarly" mounted,the governor shattzheing designated by-gl l" and. journale'd in 7 aholder r tween the stationary arms 14 andl l ted to the end of the shattframe 12. The be of any desirable. form, and

. I 60 Fig. 7 "sadeta'il view in side elevation of i is driven from thepulley 16 shown in dotted lines Fig. 1 in frictional engagement with theturn table.

Referring to Fig. 5, the motor 6 is connected at one side with the lineconductor 17 and from the other side, a conductor 18 leads to a contact19. The latter engages a separable contact 20 which in turn 18 connectedto the other side 21 of the main line to which current may be suppliedfrom any source of energy. The mainline conductor 17 also leads to acontact 22 which is normally in spaced relation to a contact 23, thelatter being electrically connected to the aforesaid contact 19. 2adesignates the switch, which in the position shown in Fig.

5, is entirely removed. from the several conor opening-28 into which theswitch arm 25 moves when the tone arm reachesa predetermined positionon, the record. In the operation of this part of the mechanism, the tonearm is set at the end of the playing position upon the record, and thestop 26 is then adjusted until the arm 25 engages the recess 28. Thisdetermines the position of adjustment for the stop 26. The switch arm 25is then withdrawn from the recess 28 as will be described morefully in amoment,

and the tone arm and stop are then moved over to the initial playinposition from which the record starts to travel. The parts are then inthe position indicated by Fig.

'5, and current is supplied to-the motor 6 from conductor 21. throughcontacts 20 and '19 successively, thence by conductor 18 to the motorand back to the other line conductor 17. The motor continues inoperation until the tone arm has traveled far enough to permit theswitch arm 25 to move into the recess 28, whereupon the switch engagesthecontact '20 and moves it away from con tact 19, breaking the circuitatthis point and thus stopping the motor.

The switch structure is indicated more fullyin Figs. 3 and 4. The switcharm 25 is actuated by a spring 29 whichis disposed in thehousing 30, andarranged between a wall'of the housing and a pin 31 on the switch arm.The pin'c'arriesa'finger piece 132 which it is movablebackand forth,-and 33 is a pivoted catch which engages the end of the pin 31 and holdsthe switch arm in retracted position for 'a purpose thatwillappearpresently. The catch 33 is arranged.

The

upon an arbor 34: having a finger piece 35 at its outer end asshown inFig. 4.

Arranged in series with the main line.

circuit is lamp 36 which is preferably positioned at a point inproximity to the turn table as shown in Fig. 1, and adapted when lightedto illuminate the surface of the record and thereby facilitate initiallypositioning the tone arm. With the arrangement illustrated in Fig. 5,the lamp 36 is always energized while the motor is energized, and whenthe contacts 19 and 20 are separated by the release of the switch,

of the main circuit.

Before the motor is startedit is desirable to close the lamp circuit tohave a light upon the lamp 36 is deenergized by the opening the record,andto this end the switch is retracted, and held in such position by thecatch 33, thereby bringing the contacts 22 and 23 into engagement withone another;

The lamp is thus lighted by current passing 7 from the conductor 21through contacts20,

19, 23 and 22, thence through conductor 17 and to the lamp while themotor is short.

circuited. When the parts are ready for the playing operation, thefinger piece 35,

is turned to release the switch arm which then assumes the intermediateposition shown in Fig. 5 during the playing operav tion. In addition toaffording a desirable,

light close to the record, the lamp 36 also provides a resistance in themotor circuit which is of considerable advantage .in

steadying the speed of the motor and thus assisting in maintainingregularity of motion of the turn table and record. A supplementalcircuit 37 and hand switch 38 may be employed for closing the lamp cir-V cuit independently of the controlling switch already described.

In the modified form'illustrated in Fig. 6 the motor is bridged directlyacross between the main line conductors while the .7

contacts 39 andv 40, also 41 and 42 are separated in the normal orplayingposition.

Y Vhen the switch arm moves ineither direction from the position shownin Fig. 6,

one or the other pair of contacts are brought into engagement with oneanother and the circuit closed at this point, thereby short circuitingthe vmotor, but maintaining current through the lamp. Otherwise theoperation is the" samealready described. 43"is' a supplemental switcharranged in the main line conductor 21 for opening the main circuitindependently of the automatic switch already de scribed. s

The operation of mydevice is as follows; the tone arm is moved to theposition it 06- as 'ythat ctipies at the end of the record, and theplate 26 is adjusted with its opening in position toregister with-thepin, .25. The pin 25 is then retracted and the tone arm moved to openingstarting position. In the operation of the machine, when the tone armmoves to the end of the record the spring 29 moves the in 25 into theopening 28 and moves the contact 20 away from the contact 19 and breaksthe circuit and automatically stops the motor.

I claim as my invention:

1. In a sound reproducing apparatus, the combination of a turn table, anelectric motor for operating said table, a tone arm movable over saidtable, an electric lamp located in proximity to said table to illuminatethe same, electrical connectionsbetween said 1110-. tor and lamp and asource of power, a switch governing said connections and movable to aplurality of positions in one of which the motor circuit is open and inanother of which the lamp circuit is closed, and actuating meanscontrolled by said tone arm for moving said switch to said position foropening the motor circuit. i

2. In a sound reproducing apparatus, the

' combination of a turn table, an electric motor connected with a sourceof power for operating said table, a lamp connected with said source ofpower in series with said motor for illuminating said table, connectionsforshort circuiting said motor, a switch movable selectively from anintermediate operating position to position for opening the motorcircuit or to position for shortcircuiting the motor, a tone arm movableacross said table and actuating means controlled by said tone arm formoving said switch to position for opening the motor circuit.

3. In a sound reproducing apparatus, the combination-with a turn tableand an electric motor for operating it, of electrical connectionsincluding said motor,a tone arm movable over the turn table, an electriclamp lo- 7 combination with a turn t'ableand an electric cated inproximity to said turn table to illuminate the same and also included insaid connections, of positions in one of which the motor circuit isopened and in the other of which positions the lamp, circuit is closed,actuating means for moving said switch to position for the motorcircuit, retaining means for said switch counteracting said actuatingmeans, and an adjustable stop on the tone arm cooperating with saidswitch and acting to release it from said retainin means at apredetermined point on a record to open the motor circuit.

4. In a sound reproducing apparatus, the combination with a turn tableand an electric motor for operating it, of electr cal connectionsincluding said motor, a tone arm mova switch movable to a plurality ableover the turn table, an electric lamp located in proximity to the turntable to illuminate the same and also included in said connections, anda switch controlled by said tone armand movable to one position in whichthe motor circuit is closed and to another position in which the lampcircuit is closed while the motor circuitis short-.cirj cuited. V

5. In a sound reproducing apparatus, the combination with a turn tableand an electric motor for operating it, of electrical connectionsincluding said motor, a tone arm movable over the turn table, anelectric lamp 10- cated in proximity to said turn table to illuminatethe same and also included in said connections, a switch movable to oneposit1on 1n'wh1ch the motor c1rcu1t s open and to another position inwhich the lamp circuit is closed while the motor circuit isshortcircuited, actuating means formoving said switch to position foropening said motor circuit and anadjustable stop on the tom armcooperating with said switch and acting to release it ata predeterminedpoint ona record to open the motor circuit.

6. In a'sound reproducing apparatus, the

combination with'a turntable and an electric motor for operating it, ofelectrical. con

nections including sald motor, an electric lamp located in proximity tosaid turn table toilluminate the sameand also included in saidconnectlons, aswitch movable to one position in which the motor circuitis closed and to another position in which the lamp circuit is closedwhile the motor circuit is shortcircuited, actuating means for movingsaid switch to said first position, and a lock-. V ing device acting" tohold theswitch in the last named position.

7. In a sound reproducing apparatus, the

motor for operating it, of electrical connections including said motor,a tone arm movable over the turn table, an electric lamp located inproXimityto saidturn table also governed by said circuit, aswitchmovable" to one position'in which the motor circuit is open and to asecond position in which the 'niotor circuit is closed and alsoto athird position in which the lamp circuit is closed while the motorcircuit is short-circuited,

THOMAS J; MURPHY.

a manually operable locking device acting i to hold the switch insaidthird position, and an adjustable stop, controlled bysaid tone

